Knife sharpener



April Q R. B. LAMBERT I 2,398,711

KNIFE SHARPENER. I

Filed Oct. 50', 1944 2 '6 INVENTORi BY a Patented Apr. 16, 1946 UNITED. STATES PATENT 1 OFFICE Application October 30, 1944, Serial No. 560,952

4 Claims.

The present invention relates to knife sharpeners having stones with opposed faces in planes intersecting at the angle of the knife edge, one of the stones being mounted for yielding reciprocating movement.

The object of the invention is to provide a simple design adapted to molded plastics. Further objects and advantages appear in the specification and claims.

In the drawing, Fig, l is a perspective of the knife sharpener; Fig. 2 is a top plan view; and Fig. 3 is a sectional side elevation.

Referring to the drawing, there is shown a knife sharpener having a base I of molded plastic having spaced upstanding projections 2 at one end having outer faces 3 smoothly merging into'the ends of the base and inner faces provided with inclined grooves 4 in which are cemented stones5. Midway between the projections 2 is a T-shaped carrier 6 having in its head I an inclined groove 8 in which is cemented a stone 9. The shank of the holder is slidably received in a projection ill at the opposite end of the base having a serrated top wall I I and end walls l2 and l3 flaring downwardly and outwardly from the top wall to the base. On the under side of the projection I is a cavity I4 having a top wall 15 providing the top guide surface for the shank i6 of the holder. At the ends of the wall H are recesses ll having bottom walls l8 providing the bottom guide surface for the holder shank. On the under side of the shank is a depending pin [9 having its lower end attached to a tension spring 20 which normally holds the pin against a stop 2| on the front Wall of the cavity and positions the holder in its forward position in which the greater part of the stone 9 is between the stones 5. The other end of the spring is attached to a pin 22 fixed in a boss 23 on the under side of the top wall 24 of the base. To prevent lateral movement of the stone 9, the lower end of the head 1 is guided on a rib 25 on the top wall of the base. The faces of the stones and 9 are in planes intersecting at the angle of the knife edge.

In use, the knife sharpener may either he gripped by the projection l0 (which has serrated gripping surfaces) or fastened to a supporting surface by a screw in a slot 26 at the end of the base between the projections 2. The knife blade is held in a substantiallyvertical position and is drawn back and forth between the stones while exerting and up and down pressure on the blade, causing reciprocation of the movable stone 9 limited by engagement of the pin IS with the stop 2| and the head I with the wall I 3. Sincethe shank of the holder for the movable stone is substantially centered, the force of the knife blade on the movable stone has a minimum tendency to tilt the holder shank in its guides.

The holder and the base are adapted to molded plastics, each part being moldable without the use of cores.

What I claim as new is:

1. In a knife sharpener, a base member, upstanding spaced projections adjacent one end thereof for supporting a plurality of abrasive stones, a plurality of stones mounted upon said projections, an upstanding projection on the base adjacent the opposite end from the aforesaid projections, said projection having a bearing channel therethrough, a T-shaped abrasive stone holder having the shank thereof slidingly mounted in said channel for reciprocably supporting said last mentioned stone between said first mentioned stones with its operating face at an acute angle to the faces of said first mentioned stones so that the operating faces of the first mentioned stones and face of the second mentioned stone lie in intersecting planes.

2. In a knife sharpener, a basemember, upstanding spaced projections adjacent one end thereof for supporting a plurality of abrasive stones, a plurality of stones mounted upon said projections, an upstanding projectionon the base adjacent the opposite end from the aforesaid projections and having a top wall and end walls at the ends of the top wall, said projection having a channel therethrough, a cavity on the under side of said projection having a top forming a bearing surface for the channel on the under side of the top wall, recesses at the ends of the top wall having lower ends at the end walls forming bottom bearing surfaces for the channel, a T-shaped abrasive stone holder having the shank thereof slidingly mounted in said channel for reciprocably supporting said last mentioned stone between said first mentioned stones with the operating face at an acute angle to the faces of said first mentioned stones so that the operating faces of the first mentioned stones and face of the second mentioned stone lie in intersecting planes.

3. In a knife sharpener, a base member, upstanding spaced projections adjacent one end thereof for supporting a plurality of abrasive stones, a plurality of stones mounted upon said projections, an upstanding projection on the base adjacent the opposite end from the aforesaid projections, said projection having a bearing channel therethrough, a T-shaped abrasive stone holder having the shank thereof slidingly mounted in said channel for reciprocably supporting said last mentioned stone between said first mentioned stones with its operating face at an acute angle to the faces of said first mentioned stones so that the operating faces of the first mentioned stones and face of the second mentioned stone lie in intersecting planes, and an interfitting guide rib and groove on the base and the lower end of the head of the T-shaped holder preventing lateral movement of the holder 10 during its reciprocation.

4. In a knife sharpener, a base member, upstanding spaced projections adjacent one end thereof for supporting a plurality of abrasive stones, a plurality of stones mounted upon said 5 tersecting planes.

REUBEN B. LAMBERT. 

